improve buffer emptying

backend/src/main.py

@@ -69,7 +69,7 @@ async def on_startup():
     # Drain any buffered packets from the sniffer (if it started earlier)
     try:
         # import sniffer here to avoid circular imports at module import time
-        from src import sniffer
+        from src import network_sniffer as sniffer
 
         # sniffer provides drain_buffer_to_shared_db()
         try: